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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ 1,824	$ 421	$ 2,945	$ 2,956
Effective tax rate	51.40%	5.10%	31.10%	14.70%
Unrecognized tax benefits	$ 3,800		$ 3,800
Unrecognized tax benefits that would impact effective rate	3,500		3,500
Decrease in unrecognized tax benefits is reasonably possible in next 12 months	100		100
Accrued interest and penalties	$ 300		$ 300		$ 300
State Administration of Taxation, China
Income Tax Contingency [Line Items]
Tax refunds		$ 1,800		$ 1,800

X

- Definition

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

+ References

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-Publisher FASB
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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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